Metal-working machine.



D. W. POND.

METAL WORKING MACHINE.

APPLIGATION FILED MAY 29,1913,

1 ,090,342, Patented Mar. 1'?, 1914.

4 SHEETS-SHEET 1.

l ama/Wto@ n nqxmmo l2. /2 ,27eme ff/Erni 07W/ Mm# may D. W. POND.

METAL WORKING MACHINE.

APPLIoATIoN FILED MAY 29, 191s.

1,090,342. Patented Mar. 1'?, 1914.

4 SHEETS-SHEET 2.

D. W. POND.

METAL WORKING MACHINE.

APPLICATION FILED MAY zo, 1913.

1,090,342. Patented Mar.17,1914.

4 SHEETS-SHEET 3.

D. W. POND.

METAL WORKING MACHINE.

APPLICATION FILED MAY 29,1913.

1,090,342. Patented Mar. 17, 1914.

4 SHEETS-SHEET 4.

JLW f @m 5,43 @513 www 'UNITED STATES APATENT OFFICE..

DANA WILLIS POND, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO DIAMOND MACHINE COMPANY, OF PROVIDENCE, RHODE ISLAND, A 'CORPORATION OF RHODE ISLAND.

METAL-VORKING MACHINE.

rocosas.

Be it known that I, DANA W. Porn, a citizen of the Unit-ed States, and resident of the city ot Providence, in the county ot' Providence and State of Rhode lsland,have

invented certain new and useful Improvements in Metal-Working Machines, ot' which the following is a specification.

This invention relates to metal working machines especially of that type having a slow moving table, such as a grinding machine or the like, and the objectof the invention is to provide auxiliary power transmit ting means driven by the machine and controlled in its action by mechanism operated at the end of the table travel in each directionJ whereby said power means is released to act upon the driving mechanism and reverse the direction oi the table travel.

A further object of the invention is to provide a shiftable cam plate operated by the reversing mechanism so arranged that it will throw one of the driving belts 'trom the tight pulley onto the loose pulley bet'ore moving the second belt from the loose pulley onto the tight pulley, so that both belts which drive in opposite directions cannot possibly engage opposite edges of the tight pulley at the same time, thereby prevent ing wearing of the belts from this cause and obviating the usual squeaking and shrieking noises which usually accompany the shitting of the belts from tight to loose pulleys.

With these and other objects in view, the invention consists of certain novel features ot' construction as will be more tally described and particularly pointed out in the appended claims.

0f the accompanying drawings: Figure 1- is an end elevation of a grinding machine to which my improved device is attached. Fig. 2 is a 'front elevation of the machine showing the table carrying the dogs which move the controlling mechanism at the end of each stroke ofthe table. Fig. 3s is a perspective view showing the general arrangement of the reversing mechanism. Fig. 4* is a front elevation partly Lin section, illustrating my improved reversing mechanism. Fig. 5 is an end view oi the reversing mechanism showing the casing in section. Fig. 6 is a plan view of the mech` Specification of Letters Patent.

Application filed May 29, 1913.

Patented Har. ill', 1914.

Serial No. 770,609.

anism showing the rocker arm and the dogs carried by the table for actuating said roeker arm to control the movement o'l' the shitting mechanism. Fig. 7 is a perspective view illustrating the cam` plate by means of which one belt is shifted be'tore or in ad..

both belts are moved onto the loose pulleysn to arrest the action of the table. Fig. Slg-i is a detail of the gear train for reciprocat` ing the work table.

Referring io the drawings the work carrying table l() is mounted to slide on suitable ways ll on the base portion l2.. This table is providerfl with dogs lil and it which are adjustable lengthwise ot the table in Lthe groove 15 in its outer edge and set in any desired position to control its stroke or length of travel. The working tool inv this particular case is shown as being a grinding wheel 1G and is mounted in the casing 17 on the main sha't't i2" and driven by the motor 1S through the pulleys 19 and il() by means of the belt 2l and the power il'or driving the table isy transmitted :lrom the. main shaft Q2 to the jack shaft 2li through the belt 25 and thence trom jack shailt 2li to drive shaft Q6 through straight and cross belts Q7 and 28 which extend through the rear base portion 29 ol" the machine over tight and loose pulleys 57, 58 and G0. This driving shaft Q6 is journaled in bearings 82 and S53 in the lower hall of the pulley easing 8d and extends iorward through the table supporting base portion l2 and has mounted thereon a train ot gears as illustrated in Fig. 9 which lead up to and engage the rack 3() on the lower side ot the table and through which train the table is driven at a cou'iparatively slow speed, so slow that it is found very dillicult in practice to shit't the belts by a direct connection actuated by the dogs as is customary in quicker action reciprocating tables, such as planer machine tables and the like. 'llieie'tme l have provided auxiliary means merely controlled by the table movement to prlisitively throw the belts and reverse the direction oi travel ot' the table, said means being described as follows: This shifting "sin, as best illustrated in Il,

compi ises a sleeve/81 which is loosely mountportion' 88 which is keyed at 39 to the sleeve 31 so as to render more edective the frictional action. of the rotating pulley on the sleeve when the collar 35 is set up to regulate the frictional tension on the pulley hub,

y means of lthe threaded nut e0, This cam 31 is provided with a cam groove el which is engaged by a pin Ll2 on the yoke 43, the latter being pivoted at le in the bracket 4:5 below. To the inner arm Ll@ of this yoke is pivoted the link 47, the opposite end of said link being connected at i8 to the cam plate 49 mounted to slide longitudinally in guides 5G. This cam plate is provided with angular slots 51 and 52 which are engaged by guide pins 58 and 5arespecti Tely, said guide pins extending into said slots from odset portions of the belt shifting arms o5 and 56 respectively, said arms being pivoted at 57 and 58u rlhe angular extensions of these cam grooves are such that when the plate is moved to the right its first action is to throw the outer end of arm 56 to the left so as to' rnove the cross belt 28 which it guides, from the tight pulley 57 onto the loose pulley 58, and by a little further movement in the same direction this plate moves the arm to the left and throws the belt 27, by means of its guide eye 58, from the loose pulley 60 onto the tight pulley 57.. 1n order to control the movement of l this cam 8l so that it will work only at the end of the table stro-ke lhave provided stop' lugs 6l and 62 constructed preferably of handened steel and firmly secured to opposite ends of the barrel of the cam. l have then mounted an abutment plate 68 to be reciprocated longitudinally in the bearing 6l and have secured said plate to lthe connecting rod 65., This connecting rod extends through the table base 12 and is provided with an upwardly extending pin 56 on its forward end. 'llhis pin 68 is engaged by one end of a rock arm 67 which is pivoted at 68 to a bracket t9 on the side of the base 12, and the opposite end of this rock arm is provided with an upwardly extending pin 70 @ne of the dogs 15a-secured to the table 10, is provided with an inwardly beveled face 7l, while the opposite dog 18 is provided with an outwardly beveled face 72, whereby when the table moves to left the face 7l of the dog 1athro-Y l c pin 70 inward to its position illust- 6 and draws the connector a ent plate 68 outward, see el, osi'tion to engage the stop lug di, lllhen the moi/*ement of the table has been reversed and approaches the opposite endr` of its stroke, the pin 70 engages the oppositely beveled face 72 of the dog 18 moving the connector 65 and its plate 68 inward out of engagement with-the stop lug 81, and into engagement; with the stop lug 62, thereby permitting the cam to be rotated by means of friction from the rotating pulley hub half a revolution.

llhe groove 41 in the cam 81 is so shaped, that when it is on a half Astroke or a quarter revolution, both of the belts 27 and 28 will be on their loose pulleys 58 and 60, therefore when it is desired to stop the table l have arranged to arrest this cam in its midway position by means of a stop latch 73 which is pivoted at 74C, see Fig. 8, said latch being provided with an overhanging lip 75, whereby when this latch. is moved up into vertical position, as shown in Fig. 8, one of the lugs G1 or (i2, the iirst to approach the same after the latch has been positioned, will engage this overhanging portion and stop the cam on its quarter stroke or revolution, throwing both of the belts onto the loose pulleys and the table immediately stops its travel. ln order to retain this latch in its stopped position 1 have provided a lock lever 76 which is provided with a notch 77 adapted to engage the pin 78 on the side of the latch. The lock is pivoted at 7 9 and has an operating handle 80.

rlhe operation of my improved belt fasteninguhechanism may be further described as fellows: ln order to secure a positive shifting mechanism of simple construction 'l have provided a pulley 87 driven continuously by belt 85 froinfj ack shaft 24:. The hub 36 of this pulley runsjbetween two friction collars 34 and which are adjustable to regulate the amount of frictional driving power to be exerted on the cam 82 through the sleeve 31. This cam is provided with two stop lugs mounted practically on opposite halves thereof and is controlled in its rotation by engagement of said lugs with an abutment plate, whereby when said plate is moved out of engagement with one stop lug it is carried across into position to engage the opposite lug thereby releasing the cam and permitting it to make a half revolution before it aOain brings'up against said plate. llhis halt revolution, as has been shown, is sutlicient to move the cam plate 49, through the yoke i3 and connecting rod 47, to the right, from the position illustrated in ll`ig-4, so as to throw the belt engaging arm 56 to move its cross belt from the tight pulley 57 to the loose pulley 58, and subsequently to move the arm 55 to throw its straight belt 27 from the loose pulley to the tight pulley 57l thereby reversing the direction of travel of the work table. r1the dogs 13 and le of course may receive relativeadjustmentinto any position along the side of the table, so as to regulate the length of table stroke, and then when either of these dogs engages the pin 70 on the rock arm G7 the abutment plate is moved to its opposite position, the cam permitted to rotate a half revolution, the belts shifted from one position to another and the direction of travel of the table reversed.

I claim:

l. In a machine of the character described, a reciprocable work table, driving means therefor, a tool for operating upon work carried by said table, and auxiliary power transmitting means actuated by said driving means and independently of said table the same being controlled indirectly by the movement of the table for reversing the direction of table travel.

2. In a machine of the character described, a reciprocable work table,. driving means therefor, auxiliary power transmitting means actuated by said driving means and independently of said table, and means actuated by the table at the end of its travel in each direction to release said transmitting means and permittingr the same to reverse the direction of travel of the table.

3. In a machine of the character described, a reciprocable work table, driving means therefor, and auxiliary power transmitting means including a power driven cam controlled in its action by the movement of the table for reversing the action of said driving means at each end of the table stroke to move the table in the opposite direction.

4. In a machine of the character described, a reciprocable work table, driving means therefor, a tool for operating upon Work carried by said table, and auxiliary power transmitting meansl including a frictionally driven cam controlled in its action by the movement of the table for reversing the action of said driving means at each end of the table stroke.

5. In a machine of the character described, a reciprocable work table, driving means therefor, a toolvfor operating upon work carried by said table, a continuously driven member, a rotatable cam under constant frictional tension by said member, means for controlling` the time and amount of rotation of said cam, and means whereby said controlling means is actuated by the movement of the table at the end of its stroke in either direction.

(S. In a machine of the character described, a reciprocable work table, driving means therefor, a tool for operating upon work carried by said table, and auxiliary power transmitting means actuated by said driving means and independently of said table controlled indirectly by the movement of the table for reversing the direction ol table travel, and means for rendering said driving means inoperative.I

7. In a machine of the character described, a reciprocable work table, driving means therefor, auxiliary power transmitting means actuated by said driving means and independently of said table, and means actuated by the table at the end of its travel in each direction to release said transmit-ting means and permitting the same to actuate the driving means to reverse the direction of travel of the table, and means for rendering said driving means inoperative.

8. In a machine of the character described, a reciprocable work table, driving means therefor, and auxiliary power transmitting means including a friction driven cam controlled in its action by the movement of the table for reversing the action of said driving means at each end of the table stroke, and means for rendering said driving means inoperative.

S). In a machine ofthe character described, a, reciprocable work table, driving means therefor, a continuously driven member, a friction driven cam for operating the reversing mechanism and acted upon by said member to be rotated when released, means acted upon by the moving table for releasing said cam at the end of each table stroke to reverse the direction of table travel, and a latch for arresting the said cam at a predetermined portion of its stroke to disconnect the driv-l ing means and render the same inoperative.

l0. In a machine of the character described, a reciprocable work table, driving means therefor, a continuously driven member, a friction driven cam for operating the reversing mechanism and acted upon bysaid member to be rotated when released, means acted upon by the moving table for releasing said cam at the end ot each table stroke to reverse the direction of table travel, and means Afor rendering said driving means inoperative.

lil. In a machine of the character described, a reciprocable work table, driving means therefor, a continuously driven mem ber, a friction driven cam for operating the reversing mechanism and acted upon by said member to be rotated when released, means acted upon by the moving table for releasing lsaid ram at the end of each table stroke to reverse the direction of table travel, and a latch for engaging said cam at a portion of its revolution to render the rlriving means inoperative.

IQ. In a machine of the character described. a reciprtu-able work table, driving means therefor, a caln, means 'for rotating said cam by friction, a reeiprocable plate positioned by said cam` means in said plate for controlling the action of said driving means. and means actuated by the movement i of said table for controlling JLhe action oi tioned by said'cam for shifting said. beits one 10' said cam to position said plate to reverse the in advance of the other, and means actuated direction of travel of said table at the end by the table for controlling the cam action. of each stroke. Y 1n testimony whereof I affix my signa-sure 13. 1n a. machine of the character dein pres-ence of two Witnesses.

scribed, a reciprocable Work table, a straighrl 1 DANA VVHJLS PGND..v and a cross belt for driving said table in op- Vitnesses: posite directions, a cam friction driving I GEO. T, HUXFORD, means therefor, reciprocable means posii TH. S. Crimine.` 

